For He was made man that we might be made God; and He manifested Himself by a body that we might receive the idea of the unseen Father; and He endured the insolence of men that we might inherit immortality. For while He Himself was in no way injured, being impassible and incorruptible and very Word and God, men who were suffering, and for whose sakes He endured all this, He maintained and preserved in His own impassibility. (Athanasius, De inc. 54.3)
Here is the relevant text from Migne, PG 25:192B:
